The no-frills carrier said the new 180-seater A320 planes will allow it to boost the number of passengers it can carry from 60 million a year to around 90 million.

Its new aircraft will also be more fuel-efficient, which means they cost less to run and are more environmentally friendly.

The move will allow easyJet, which flies to 32 destinations from Manchester Airport, to replace around 85 of its current 211-strong fleet of 156-seater planes, as well as giving it the room to expand and add routes.

It also has the option to buy a further 100 Airbus planes as part of the deal.

But the scale of the fleet acquisition means easyJet must get shareholder approval, with the backing of 50 per cent of investors required, and is likely to reignite the long-running row with founder and largest shareholder Sir Stelios Haji-Iaonnou.

Sir Stelios, who with his family controls a near-37 per cent stake in easyJet, has been a vocal opponent of the group's plans to increase its fleet.

He said earlier this year that he believes the new planes are not necessary and will be acquired at the detriment of shareholders.

Luton-based easyJet has ordered 35 current generation A320 planes for delivery between 2015 and 2017 and 100 new generation A320neo aircraft from 2017 until 2022.

It said it secured a steep discount for the planes, but did not disclose the cost of the deal.

Carolyn McCall, chief executive of easyJet, said: "This is a great outcome for easyJet, our shareholders and our passengers, and will ensure that easyJet is able to continue its successful strategy of delivering profitable growth and returns to shareholders."

EasyJet said the new aircraft would allow it to fulfil aims to increase its seat capacity by between 3 per cent and 5 per cent a year, while slashing costs per seat by between 11 per cent and 12 per cent.

It said if the deal did not go through, costs per seat would be around £2.98 higher in 10 years' time, which it claims would have a "material" impact on profits.

The group plans to buy around 30% of the new aircraft outright and lease the remainder through third parties.

It will spend the next few weeks meeting major shareholders to garner support ahead of the investor vote on July 11.